code: def __call__(self, X: gf.base.TensorType) -> tf.Tensor:
      return self.var_mean
  
file_path: GPflow/doc/sphinx/notebooks/advanced/varying_noise.pct.py
imports: import os
  import warnings
  from typing import Optional, Tuple
  import matplotlib.pyplot
  import numpy
  import tensorflow
  from check_shapes import inherit_check_shapes
  import gpflow
  from gpflow.ci_utils import reduce_in_tests
  from gpflow.utilities import print_summary
label_desc: Use image node_id 2 for calling the FixedVarianceOfMean obj's underlying member method code with example usage: obj.__call__(X) and returns: self